Rational therapeutic strategy for T2 gallbladder carcinoma based on tumor spread

Table 1 Extent of tumor spread by ss score

Vertical invasion	< 1/3 in depth	α: score 1
	≥ 1/3 and < 2/3	β: score 2
	≥ 2/3	γ: score 3
Horizontal invasion	< 5 mm	A: score 1
	≥ 5 mm and < 10 mm	B: score 2
	≥ 10 mm	C: score 3

The sum total of ss score was calculated. ss minimum (ss min): 2; ss medium (ss med): 3-4; ss massive (ss mas): 5-6.